NourmioWhy don't label calories match the macros?
See why the 4/4/9 calculation can differ from a US Nutrition Facts label, and which calorie number to use for the portion you ate.
Use the Calories line for the serving you ate. Multiplying the printed grams of protein, total carbs and fat by 4, 4 and 9 gives a rough check. The label can use unrounded amounts and a method that treats fiber differently, so the two numbers can disagree.
One tortilla, two calorie numbers
The full Mission Carb Balance Soft Taco Flour Tortillas panel shows 70 calories for one 43 g tortilla. It lists 6 g of protein, 19 g of total carbohydrate and 3.5 g of fat. Apply the 4/4/9 shortcut to those printed amounts and you get 131.5 kcal.
| Printed amount | Shortcut calculation |
|---|---|
| 6 g protein | 6 × 4 = 24 kcal |
| 19 g total carbohydrate | 19 × 4 = 76 kcal |
| 3.5 g total fat | 3.5 × 9 = 31.5 kcal |
| Shortcut total | 131.5 kcal |
The carbohydrate row includes 17 g of dietary fiber on this panel. The shortcut counts every one of those grams at 4 kcal. Mission explains that its method for Carb Balance adjusts for fiber. The FDA rule also allows methods that use food-specific factors or account for some carbohydrates separately. The printed panel gives you the total fiber, but it doesn’t tell you the exact unrounded amounts or how much fiber was soluble. Those details would be needed to work back to 70.
How rounding alone changes the math
Take an invented serving with 8.49 g of protein, 10.49 g of carbohydrate and 5.49 g of fat. Using the general factors on those amounts gives 125.33 kcal. In this range, the calorie line rounds to the nearest 10, so the label would show 130 calories.
The three nutrient rows round separately. They’d show 8 g, 10 g and 5 g. Multiply those rounded amounts by 4, 4 and 9 and the answer is 117 kcal. The factors stayed the same. The numbers you fed into the calculation changed.
Which calories to put in your diary
Check that the listing matches your package and that both use the same serving. With the tortilla panel above, enter 70 kcal for one tortilla or 140 kcal for two, then add any fillings separately. If your package lists a different number, use the label in your hand.
In Nourmio, check a barcode result against the package before saving. You can enter the label values yourself if the entry doesn’t match.